Scaling apparatus set in a receiver

A receiver and scaling technology, applied in the directions of amplification control, modulation carrier system, transmission system, etc., can solve the problem of unable to adjust the signal amplitude to a suitable range, and achieve the effect of stable quality

Active Publication Date: 2012-10-03
XUESHAN TECH INC
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Problems solved by technology

[0006] In order to solve the technical problem in the prior art that the signal amplitude cannot be adjusted to an appropriate range when the channel state in the receiver changes drastically due to the high-speed movement of the receiver or transmitter, the present invention provides a Scaling device installed in the receiver

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  • Scaling apparatus set in a receiver
  • Scaling apparatus set in a receiver
  • Scaling apparatus set in a receiver

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Embodiment Construction

[0014] see figure 1 , figure 1 Shown is a schematic diagram of the scaling device provided in the receiver in the first embodiment of the present invention. In this embodiment, the receiver is an OFDM receiver that adopts a Decimation in Frequency (DIF) Fast Fourier Transform (FFT) mechanism. The OFDM receiver includes a filter 110 , a digital automatic gain control (digital AGC) unit 120 , a fast Fourier transform unit 130 , a bit-reversal (bit-reversal) unit 140 , and a scaling device 150 . Wherein the fast Fourier transform unit 130 generates a disordered frequency domain symbol (disorderly symbol) with a plurality of sub-carriers (sub-carrier) according to the time domain symbol (domain symbol) received from the digital automatic gain control unit 120, namely , the subcarriers of the output unordered frequency domain symbols are not sequentially arranged according to the frequencies of consecutive subcarriers. For each out-of-order symbol, the bit inversion unit 140 is ...

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Abstract

A scaling apparatus set in a receiver is disclosed. The receiver includes a symbol-processing unit. The scaling apparatus includes a calculating unit and a scaling unit. The calculating unit estimates the signal strength of an input symbol and generates a scaling factor accordingly. The scaling unit scales an output symbol outputted from the symbol-processing unit according to the scaling factor.The output symbol is generated from the symbol-processing unit through processing the input symbol.

Description

technical field [0001] The present invention relates to receivers and in particular to a scaling apparatus which processes each symbol one by one and which is provided in the receiver. Background technique [0002] Generally speaking, a receiver usually includes a variable gain amplifier to adjust the amplitude of the received signal before the received signal enters an analog-to-digital converter (ADC). This is because if the amplitude of the received signal entering the A / D converter is too large, it will lead to saturation, which will cause the output of the A / D converter to be distorted; and if the amplitude of the received signal entering the A / D converter is too small , it will cause the signal-to-noise ratio (signal-to-noise ratio, SNR) to become too small, thereby affecting the performance of the receiver. Usually, the above-mentioned problem is solved by adjusting the gain value (gain) of the variable gain amplifier through a control signal, and this method is also...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00
CPCH03G3/3089H04L27/2614H04L27/2647H03G3/3078
Inventor 林哲立
Owner XUESHAN TECH INC
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